By co-culturing human T lymphocytes with TNP-treated autologous B lymphocytes and macrophages for 10 days in vitro, sensitization to TNP-treated autologous cells could be detected in a proliferative assay. By restimulation with different types of allogeneic cells and with cells from donors compatible or incompatible for the HLA-ABC or -D determinants, results were obtained suggesting that the TNP-specific response was restricted by the HLA-D but not the -ABC antigens of the autologous priming cells. Furthermore, our experiments demonstrate that T lymphocytes can also be primed against non-treated autologous cells in vitro and suggest that the HLA-D determinants may be involved also in this auto-sensitization.
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